钦-杭成矿带南段庞西垌断裂带热年代学证据

丁汝鑫; 虞鹏鹏; 胡光明; 邹和平; 曾长育; 周永章

doi:10.3799/dqkx.2018.609

Volume 43 Issue 6

Jun. 2018

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Article Navigation > Earth Science > 2018 > 43(6): 1830-1838

Ding Ruxin, Yu Pengpeng, Hu Guangming, Zou Heping, Zeng Changyu, Zhou Yongzhang, 2018. Thermochronology of Pangxidong Fault Zone in Southern Section of Qin-Hang Metallogenic Belt. Earth Science, 43(6): 1830-1838. doi: 10.3799/dqkx.2018.609

Citation:

Ding Ruxin, Yu Pengpeng, Hu Guangming, Zou Heping, Zeng Changyu, Zhou Yongzhang, 2018. Thermochronology of Pangxidong Fault Zone in Southern Section of Qin-Hang Metallogenic Belt. Earth Science, 43(6): 1830-1838. doi: 10.3799/dqkx.2018.609

Citation:

Ding Ruxin, Yu Pengpeng, Hu Guangming, Zou Heping, Zeng Changyu, Zhou Yongzhang, 2018. Thermochronology of Pangxidong Fault Zone in Southern Section of Qin-Hang Metallogenic Belt. Earth Science, 43(6): 1830-1838. doi: 10.3799/dqkx.2018.609

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Thermochronology of Pangxidong Fault Zone in Southern Section of Qin-Hang Metallogenic Belt

doi: 10.3799/dqkx.2018.609

1.
School of Earth Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
2.
Guangdong Provincial Key Lab of Geological Processes and Mineral Resource Survey, Guangzhou 510275, China
3.
Low-T Lab, Shanghai 201101, China
4.
School of Geosciences, Yangtze University, Wuhan 430100, China

Received Date: 2018-01-24
Publish Date: 2018-06-15

Abstract

Abstract

The Pangxidong fault zone is one of many NE-strength ductile shear zones in the southern section of the Qin-Hang metallogenic belt and controls the distribution of a series of ductile shear zones related Ag-Au deposits. Study on its thermochronology is helpful to understand the tectonic evolution of the NE-trending ductile shear zone in the southern part of the Qin-Hang metallogenic belt and its effect on the associated mineral deposits. A set of muscovite ⁴⁰Ar/³⁹Ar and fission track analysis were carried out in this paper. Two muscovite samples from the mylonite yielded ⁴⁰Ar/³⁹Ar isotopic total gas ages of 221.98±1.16 Ma and 223.77±1.16 Ma, respectively. It is interpreted that the ductile shearing happened in Pangxidong fault zone during the Indosinian period, which is believed to have provided favorable space for the formation of associated mineral deposits.Apatite and zircon fission track ages from the same mylonite sample yield 64.83±4.13 Ma and 75.69±2.88 Ma, respectively. Combined with the thermal history modeling results, it is shown that the fault zone had experienced a rapid cooling process during~75-60 Ma(6.2 ℃/Ma), which is much different from the slow cooling process of the Yunkai region (1.5 ℃/Ma). The results suggest that the Pangxidong fault zone was active again during~75-60 Ma and the Pangxidong Ag-Au deposits possibly formed in the Late Cretaceous.
- Qin-Hang metallogenic belt,
- Pangxidong fault zone,
- ⁴⁰Ar/³⁹Ar dating,
- fission track analysis,
- petroleum geology

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References(38)

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